21311505001 has 8 divisors (see below), whose sum is σ = 21443304960. Its totient is φ = 21180028992.

The previous prime is 21311504999. The next prime is 21311505011. The reversal of 21311505001 is 10050511312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21311505001 - 2¹ = 21311504999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21311505001.

It is not an unprimeable number, because it can be changed into a prime (21311505011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51660 + ... + 212818.

It is an arithmetic number, because the mean of its divisors is an integer number (2680413120).

Almost surely, 2^21311505001 is an apocalyptic number.

It is an amenable number.

21311505001 is a deficient number, since it is larger than the sum of its proper divisors (131799959).

21311505001 is a wasteful number, since it uses less digits than its factorization.

21311505001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161975.

The product of its (nonzero) digits is 150, while the sum is 19.

The spelling of 21311505001 in words is "twenty-one billion, three hundred eleven million, five hundred five thousand, one".